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LTC1606IG Datasheet(PDF) 9 Page - Linear Technology |
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LTC1606IG Datasheet(HTML) 9 Page - Linear Technology |
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9 / 16 page  9 LTC1606 1606fa capacitor as close to the device input pin as possible. If an amplifier is to be used to drive the input, care should be taken to select an amplifier with adequate accuracy, linear- ity and noise for the application. The following list is a summary of the op amps that are suitable for driving the LTC1606. More detailed information is available in the Linear Technology data books and LinearView TM CD-ROM. LT1007: Low noise precision amplifier. 2.7mA supply current ±5V to ±15V supplies. Gain bandwidth product 8MHz. DC applications. LT1097: Low cost, low power precision amplifier. 300 µA supply current. ±5V to ±15V supplies. Gain bandwidth product 0.7MHz. DC applications. LT1227: 140MHz video current feedback amplifier. 10mA supply current. ±5V to ±15V supplies. Low noise and low distortion. LT1360: 37MHz voltage feedback amplifier. 3.8mA supply current. ±5V to ±15V supplies. Good AC/DC specs. LT1363: 50MHz voltage feedback amplifier. 6.3mA supply current. Good AC/DC specs. LT1364/LT1365: Dual and quad 50MHz voltage feedback amplifiers. 6.3mA supply current per amplifier. Good AC/ DC specs. LT1468: 90MHz 22V/ µs 16-bit accurate amplifier. LT1469: Dual LT1468 Internal Voltage Reference The LTC1606 has an on-chip, temperature compensated, curvature corrected, bandgap reference, which is factory trimmed to 2.50V. The full-scale range of the ADC is equal to ( ±4 • VREF) or nominally ±10V. The output of the reference is connected to the input of a buffer (1.64x) through a 4k resistor (see Figure 3). The input to the buffer or the output of the reference is available at REF (Pin 3). The internal reference can be overdriven with an external reference if more accuracy is needed. The buffer output drives the internal DAC and is available at CAP (Pin 4). The CAP pin can be used to drive a steady DC load of less than 2mA. Driving an AC load is not recommended because it can cause the performance of the converter to degrade. Figure 3. Internal or External Reference Source – + 1606 • F03 INTERNAL CAPACITOR DAC BANDGAP REFERENCE 4k 10 µF CAP (4.096V) 2.2 µF REF (2.5V) 4 3 R 0.64R APPLICATIO S I FOR ATIO For minimum code transition noise, the REF pin and the CAP pin should each be decoupled with a capacitor to filter wideband noise from the reference and the buffer (2.2 µF tantalum for the REF pin and 10µF tantalum for the CAP pin). To prevent the 10 µF bypass capacitor from discharging through the CAP pin if the positive supply (VDIG and VANA) were to drop, a diode (1N4148 or equivalent) can be placed between the CAP pin and the positive supply. Offset and Gain Adjustments The LTC1606 offset and full-scale errors have been trimmed at the factory with the external resistors shown in Figure 4. This allows for external adjustment of offset and full scale in applications where absolute accuracy is impor- tant. See Figure 5 for the offset and gain trim circuit. The 100k resistor in parallel with the 33.2k is only needed for externally trimming the offset. First, adjust the offset to zero by adjusting resistor R3. Apply an input voltage of –152.6 µV (–0.5LSB) and adjust R3 so the code is + 5 4 3 2 1 10 µF 2.2 µF 33.2k 1% ±10V INPUT 200 Ω 1% VIN AGND1 REF CAP 4.096V AGND2 LTC1606 1606 • F04 Figure 4. ±10V Input Without Trim LinearView is a trademark of Linear Technology Corporation |
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